The richest person in ancient Greece had to pay a special tax. The rulers rode to Alexander, a very rich man, and asked for the tax. Alexander, who liked his fortune, told them that they had the wrong person. He was not the richest, he was only the second richest. "Go to my neighbour, he is richer than me."
So the rulers rode to his neighbour Damaskenos, also a very rich man. Damaskenos, though he had a large ego, preferred money to fame and claimed that Alexander was the richer man.
The rulers took both Alexander and Damaskenos to court where they argued for hours about who was the richest of them. Both of them knew who truly was richest, since they were competitors and had spies in each other's villas. But none gave up.
The rulers of Greece were powerful. They could use the law to it's full extent, but they were also fair. They couldn't tax someone without knowing for certain they were the right person. What did they do?